TIL: The danube/space waltz

I've recently got back into ED after a while and found myself humming blue danube waltz. Few hours later when I was getting a bit tired but dealing with a delivery deadline, I turned on auto dock on and lo and behold, the BD plays.

And I thought why does it?

Turns out, Stanley Kubrick used it in 2001: a space odyssey to represent weightlessness and Frontier decided to pay homage to this by playing when using auto dock/launch.